Could this work? If it does, where does the heat go? If it doesn't, why do they claim a temperature drop?_________________"Buddhists say we come back as animals and they refer to them as lesser beings. Well, animals aren’t lesser beings, they’re just like us. So I say fụck the Buddhists" - Bjork

I do not believe that it removes heat from indoors as does an electric air conditioner.
It would in some conditions reduce temperatures by reducing solar gain whilst still permitting ventilation. An open window with an external awning or sunshade would permit of maximum airflow whilst almost eliminating solar gain.

A more significant improvement would be a sunshade and an electric fan. Fans use very little electricity and are affordable to use from grid power, or DC fans are easily powered from small and cheap PV systems.
A fan does not normally reduce the actual temperature, but does greatly improve comfort by promoting evaporation of perspiration._________________"Installers and owners of emergency diesels must assume that they will have to run for a week or more"

I do not believe that it removes heat from indoors as does an electric air conditioner.
It would in some conditions reduce temperatures by reducing solar gain whilst still permitting ventilation. An open window with an external awning or sunshade would permit of maximum airflow whilst almost eliminating solar gain.

A more significant improvement would be a sunshade and an electric fan. Fans use very little electricity and are affordable to use from grid power, or DC fans are easily powered from small and cheap PV systems.
A fan does not normally reduce the actual temperature, but does greatly improve comfort by promoting evaporation of perspiration.

It's just a way of speeding up the air and making it feel a little cooler from what I can see. Might help a little I suppose.

If on the windy side of a property it could slightly compress air which cools a bit on expansion. The waste heat would go into the air and bottles on the outside. It would be interesting to see test results.

I think it works in the same way that mountains cool air and cause rain. The wind blows from the sea / a plain over mountains and the air flow is compressed and speeds up. This cools the air which then condenses any moisture which then falls as rain. As the air then expand again and slows it warms but with a lower moisture content. This drier air would then help keep people cool as it would evaporate sweat more effectively.

If you stood next to the window you might get some cooled air but further into the room you should get drier air. Not sure how much cooling that you would actually get; it would depend on the relative air speeds, I suppose._________________"When the last tree is cut down, and the last river has been poisoned, and the last fish has been caught, Only then will you find out that you cannot eat money". --The Cree Indians

Mountains cool air because the air is forced to rise, and the cooling occurs adiabatically at a rate of between 1.5ºC and 3ºC per 1000ft as the air expands. As it is carrying moisture the point is reached where the air can no longer hold the moisture so it drops out as rain, or maybe snow, or fog.

The bottle coolers only provide cooling in buildings which have poor insulation, little thermal mass and so have tremendous heat gain. In well insulated building with large thermal mass it is better to keep ventilation to a minimum so the mass absorbs the heat and reduces the temperature increase._________________If you think the economy is more important than the environment, try holding your breath while you count your money.

Now one of my own. Thermal mass will only cool a building if there is a source of cool air, e.g. cooler night temperatures, which can be used to cool the structure. Where you have hot temperatures for 24 hours thermal mass is a distinct disadvantage. In such circumstances you usually find that light weight structures are normally used.

Heavy weight structures are common in hot desert climes where the nights tend to be much cooler than the day. These structures often incorporate wind towers to force ventilation combined with an airflow into cooler cellar areas below ground. They also are often built around a closed, outside windowless, courtyard with a fountain in the middle to assist cooling._________________"When the last tree is cut down, and the last river has been poisoned, and the last fish has been caught, Only then will you find out that you cannot eat money". --The Cree Indians

What I wrote about the buildings was not contradictory to your reply, I just didn't explain as fully as you did._________________If you think the economy is more important than the environment, try holding your breath while you count your money.

Having just reread that last few posts, it has reminded me that this window fitting would seem to work in the same way that the wind tower does. The new ecotown, who's name escapes me at the moment, built in the desert of the UAE has wind towers which cool the streets by moving the air._________________"When the last tree is cut down, and the last river has been poisoned, and the last fish has been caught, Only then will you find out that you cannot eat money". --The Cree Indians

Extreme heat in various parts of Europe, said to be directly dangerous to human health in the worst affected areas.
http://www.bbc.co.uk/news/world-europe-40825668_________________"Installers and owners of emergency diesels must assume that they will have to run for a week or more"